Detailed Information for C₇H

Last Update: JeffMangum - 16 Dec 2005

Laboratory Measurements: Travers, M. J., McCarthy, M. C., Gottlieb, C. A., and Thaddeus, P., Laboratory Detection of the C7H Radical, 1996, ApJ, 465, L77

Molecular Structure and Constants:

• Electronic Ground State Doublet Pi
• Aeff = 769735(16) MHz (25.68 cm-1)
• B = 875.48405(6) MHz
• D x 10^6 = 11.280 (4) MHz
• p + 2q = 1.574(11)
• q = -.0164(2)
• Doublet Pi 1/2 Rotational Constant Beff=874.4869(2) MHz Deffx10^6=10.04(2) (Travers et al. 1996)
• Doublet Pi 3/2 Rotational Constant Beff=876.4812(2) MHz Deffx10^6=12.53(1) (Travers et al. 1996)
• Dipole Moment 5.95 Debye (est.)

Astronomical Detection: Guelin, M., Cernicharo, J., Travers, M. J., McCarthy, M. C., Gottlieb, C. A., Thaddeus, P., Ohishi, M., Saito, S., and Yamamoto, S., Detection of a New Linear Carbon Chain Radical: C7H, 1997, A&A, 317, L1. Five lines observed toward the evolved carbon star IRC+10216 indicate the molecule is four times less abundant than C8H and twenty times less abundant than C5H in the molecular shell surrounding the star. Typically, in the J=48.5 -> 47.5 transitions near 85 GHz, an integrated line intensity of 0.08(2) was observed in each of the lambda-doublet components with the IRAM 30m telescope.